Description of problem:
Time zone added to schedule last Attribute/Value pair

Version-Release number of selected component (if applicable):
5.8.0.17.20170525183055_6317a22

How reproducible:
Always

Steps to Reproduce:
1. Go to Configuration > Settings > Region > Schedules
2. Create new Schedule:
Name: something
Description: something
Active: V
Action: Automation Tasks
System/Process: Request
Message: create
Request: Call_Instance
Attribute/Value Pairs: some_attribute some_value
Run: Hourly every hour
Timezone: GMT+00:00 UTC

3. Save, and view the new schedule.

Actual results:
Attribute/Value Pairs: some_attribute some_valueUTC

Expected results:
Attribute/Value Pairs: some_attribute some_value

Additional info:
It will do that to the last pair only.
It's not UI issue, but actually breaks the schedule (it will pass the value 'some_valueUTC' instead of 'some_value').
It doesn't show up in evm.log or api.log